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Journal articles on the topic 'Pyridine-4-carboxylic acid'

Author: Grafiati

Published: 5 June 2025

Last updated: 1 August 2025

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1

Gillis, RG, and QN Porter. "5-Methoxyphenanthrene-4-carboxylic Acid." Australian Journal of Chemistry 42, no. 6 (1989): 1007. http://dx.doi.org/10.1071/ch9891007.

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Lead tetraacetate oxidation of phenanthrene-4,5-dicarboxylic acid in acetonitrile with pyridine affords 5-hydroxyphenanthrene-4-carboxylic acid as its lactone , which can be methylated as the sodium salt, giving 5-methoxyphenanthrene-4-carboxylic acid, albeit in poor yield. New spectroscopic evidence (particularly 13C n.m.r.) confirms that 5-formylphenanthrene-4-carboxylic acid, which is an intermediate in the synthesis, exists as the lactol , 4-hydroxyphenanthro[4,5-cdeloxepin-G(4H)-one.

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2

Saeed, Atif, Lubna Shakir, Mahtab A. Khan, Arsalan Ali, and Awais Ali Zaidi. "Haloperidol induced Parkinson’s disease mice model and motor-function modulation with Pyridine-3-carboxylic acid." Biomedical Research and Therapy 4, no. 05 (2017): 1305. http://dx.doi.org/10.15419/bmrat.v4i05.169.

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Introduction: Motor-function modulation through Pyridine-3-carboxylic acid was assessed against. Haloperidol induced Parkinson’s disease (PD) in albino-mice. The objectives of this study were to test the effect of Haloperidol in development of PD, effectiveness of Pyridine-3-carboxylic acid in mice and evaluation of the motor-function changes in mice before and after treatment. Methods: The study was divided into 3 phases: During Phase-I (randomization), all the subjects were randomly divided into 4 groups and trained for wire-hanging, grip strength, vertical rod and swim tests for 1 wee

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3

Ye, Naike, and Joseph M. Tanski. "The crystal structure of 5-(trifluoromethyl)picolinic acid monohydrate reveals a water-bridged hydrogen-bonding network." Acta Crystallographica Section E Crystallographic Communications 76, no. 11 (2020): 1752–56. http://dx.doi.org/10.1107/s2056989020013523.

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The title compound [systematic name: 5-(trifluoromethyl)pyridine-2-carboxylic acid monohydrate], C7H4F3NO2·H2O, is the acid hydrate of a pyridine with a carboxylic acid group and a trifluoromethyl substituent situated para to one another on the aromatic ring. The molecule forms a centrosymmetric water-bridged hydrogen-bonding dimer with graph-set notation R 4 4 (12). Hydrogen-bonding distances of 2.5219 (11) and 2.8213 (11) Å are observed between the donor carboxylic acid and the bridging water acceptor, and the donor water and carbonyl oxygen acceptor, respectively. The dimers are further lin

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4

Ifeanacho, Ezetonu Abireh, Christian Ejuiwa Mba, and Chiadikobi Lawrence Ozoemena. "ACUTE NICOTINE & PYRIDINE-3-CARBOXYLIC ACID SYNERGY PROTECTS NICOTINE INDUCED TESTICULAR DEGENERATION AND MODERATES MALONDIALDEHYDE LEVELS." International Journal of Novel Research in Healthcare and Nursing 11, no. 1 (2024): 125–30. https://doi.org/10.5281/zenodo.10612811.

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<strong>Abstract:</strong><em> </em>Nicotine is a naturally produced alkaloid in the Solanaceae family of plants, widely used as a recreational substance or an anxiolytic and acts as a receptor agonist at most nicotinic acetylcholine receptors (nAChRs). Pyridine 3-carboxylic acid is a monocarboxylic derivative of pyridine. Also known as niacin, it is a water-soluble vitamin that is indispensable in the diet of humans and animals and has a variety of important applications, such as in matrices for matrix-assisted laser desorption ionization (MALDI) mass spectrometr

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5

Wibaut, J. P. "The preparation of pyridine-4-carboxylic acid and of piperidine-4-carboxylic acid by catalytic reduction of 2,6-dichloropyridine-4-carboxylic acid." Recueil des Travaux Chimiques des Pays-Bas 63, no. 7 (2010): 141–46. http://dx.doi.org/10.1002/recl.19440630704.

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6

Qin, Zengquan, Hilary A. Jenkins, Simon J. Coles, Kenneth W. Muir, and Richard J. Puddephatt. "Self-assembly of one-dimensional polymers by coordination and hydrogen bonding in palladium(II) complexes." Canadian Journal of Chemistry 77, no. 1 (1999): 155–57. http://dx.doi.org/10.1139/v99-027.

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The ligands L = pyridine- or quinoline-carboxylic acid easily give complexes trans-[PdCl2L2], which self-assemble through hydrogen bonding between carboxylic acid groups to give one-dimensional polymers, as proved by structure determinations when L = NC5H4COOH-4, NC5H4COOH-3, and 2-Ph-NC9H5COOH-4.Key words: polymer, hydrogen-bonding, palladium, coordination.

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7

Smith, Graham, and Urs D. Wermuth. "4-(4-Nitrobenzyl)pyridinium 3-carboxy-4-hydroxybenzenesulfonate." Acta Crystallographica Section E Structure Reports Online 69, no. 2 (2013): o206. http://dx.doi.org/10.1107/s1600536813000093.

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In the title salt, C12H11N2O2+·C7H5O6S−, the dihedral angle between the benzene and pyridine rings in the 4-(4-nitrobenzyl)pyridinium cation is 82.7 (2)°. Within the anion there is an intramolecular hydroxy-O—H...O(carboxylic acid) bond. In the crystal, the cation forms a single N+—H...Osulfonatehydrogen bond with the anion. These cation–anion pairs interact through duplex anion carboxylic acid O—H...Osulfonatehydrogen bonds, giving a centrosymmetric cyclic association [graph setR22(16)]. The crystals studied were non-merohedrally twinned.

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8

Sinaga, Cinthia Uly Hotnami, and Asep Wahyu Nugraha. "Determining the Most Stable Structure of Benzamided Derivatives Using Density Functional Theory (DFT)." Indonesian Journal of Chemical Science and Technology (IJCST) 4, no. 2 (2021): 49. http://dx.doi.org/10.24114/ijcst.v4i2.27594.

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This study aims to determine the energy change ∆E and determine the most stable compound based on computation results using the Density Functional Theory (DFT) method. In determining the energy change ∆E and determining the most stable compound, computational chemical calculations were used using NWChem version 6.6 software with the DFT method with the B3LYP / 3-21G base set hybrid function, the results of the calculations were visualized using the Jmol software. The results of computational calculations on the compound Benzamide is 57467.3632844735 kJ / mol, (4 - chlorocarbonyl - benzial) - p

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9

Shiga, Takuya, Mao Noguchi, Takuto Matsumoto, et al. "A series of tetranuclear [2 × 2] grid complexes derived from an asymmetric ligand: Structural differences based on metal ion affinities." Pure and Applied Chemistry 83, no. 9 (2011): 1721–29. http://dx.doi.org/10.1351/pac-con-10-12-01.

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A series of tetranuclear grid-type complexes were prepared by the reaction of the asymmetric multidentate ligand HL (HL = 2-[3-(2-hydroxyphenyl)-1H-pyrazol-5-yl]-6-pyridine carboxylic acid ethylester) with different metal sources. The tetranuclear copper complex, [Cu4(L1)4(NO3)4(H2O)4]·Et2O·2MeOH (1, HL1 = 2-[3-(2-hydroxyphenyl)-1H-pyrazol-5-yl]-6-pyridine carboxylic acid methyl ester) consists of four ligands, four copper ions, four nitrate ions and four water molecules, forming a [2 × 2] grid structure, in which all four copper ions have the same coordination environment. On the other hand,

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10

Pinheiro, Luiz C. S., Alice M. R. Bernardino, Solange M. S. V. Wardell, James L. Wardell, and Edward R. T. Tiekink. "4-(3-Fluoroanilino)thieno[2,3-b]pyridine-6-carboxylic acid." Acta Crystallographica Section E Structure Reports Online 68, no. 7 (2012): o2217—o2218. http://dx.doi.org/10.1107/s1600536812027195.

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11

Li, Bao, Po Gao, Ling Ye, Guang-Di Yang та Li-Xin Wu. "Bis(pyridine-4-carboxylic acid-κN)silver(I) nitrate dihydrate". Acta Crystallographica Section E Structure Reports Online 62, № 12 (2006): m3238—m3239. http://dx.doi.org/10.1107/s1600536806045624.

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12

Ding, Tao, Li-Di Ren, Xiao-Di Du, et al. "Six new coordination polymers based on a tritopic pyridyldicarboxylate ligand: structural, magnetic and sorption properties." CrystEngComm 16, no. 33 (2014): 7790–801. http://dx.doi.org/10.1039/c4ce00890a.

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Using a rigid ligand, pyridine-3,5-bis(phenyl-4-carboxylic) acid, six new coordination polymers have been synthesized and characterized, and their magnetic, photoluminescence and gas adsorption properties have been studied.

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13

Arman, Hadi D., and Edward R. T. Tiekink. "2-Aminobenzoic acid–4-[2-(pyridin-4-yl)ethyl]pyridine (2/1)." Acta Crystallographica Section E Structure Reports Online 69, no. 11 (2013): o1616. http://dx.doi.org/10.1107/s1600536813027128.

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The asymmetric unit of the title co-crystal, C12H12N2·2C7H7NO2, comprises a centrosymmetric 4-[2-(pyridin-4-yl)ethyl]pyridine molecule and a 2-aminobenzoic acid molecule in a general position. The acid has a small twist between the carboxylic acid residue and the ring [dihedral angle = 7.13 (6)°] despite the presence of an intramolecular N—H...O(carbonyl) hydrogen bond. Three-molecule aggregates are formedviaO—H...N(pyridyl) hydrogen bonds, and these are connected into supramolecular layers in thebcplane by N—H...O(carbonyl) hydrogen bonds and π–π interactions between pyridine and benzene ring

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14

Ahmed, Essam Kh, Mohamed A. Ameen, and Fathy F. Abdel-Latif. "Microwave-Assisted Synthesis of Novel Imidazo- and Pyrimidopyrido[4’,3’:4,5]thieno[2,3-d]pyrimidines." Zeitschrift für Naturforschung B 60, no. 2 (2005): 221–26. http://dx.doi.org/10.1515/znb-2005-0216.

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It is reported on the microwave-assisted synthesis of imidazo- and pyrimidopyrido [4’,3’:4,5]thieno[ 2,3-d]pyrimidines from 2-ethoxymethylene-amino-3-cyano-4,5,6,7-tetrahydrothieno[2,3-c]- pyridine-6-carboxylic acid ethyl ester and 4-chloro-pyridothieno[2,3-d]pyrimidine.

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15

Sarcevica, Inese, Liana Orola, Mikelis V. Veidis, and Sergey Belyakov. "Cinnamic acid hydrogen bonds to isoniazid andN′-(propan-2-ylidene)isonicotinohydrazide, anin situreaction product of isoniazid and acetone." Acta Crystallographica Section C Structural Chemistry 70, no. 4 (2014): 392–95. http://dx.doi.org/10.1107/s2053229614003684.

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A new polymorph of the cinnamic acid–isoniazid cocrystal has been prepared by slow evaporation, namely cinnamic acid–pyridine-4-carbohydrazide (1/1), C9H8O2·C6H7N3O. The crystal structure is characterized by a hydrogen-bonded tetrameric arrangement of two molecules of isoniazid and two of cinnamic acid. Possible modification of the hydrogen bonding was investigated by changing the hydrazide group of isoniazidviaanin situreaction with acetone and cocrystallization with cinnamic acid. In the structure of cinnamic acid–N′-(propan-2-ylidene)isonicotinohydrazide (1/1), C9H8O2·C9H11N3O, carboxylic a

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16

Guo, Yuting, Xinyu Hao, Ying Wang, and Lei Guan. "Syntheses, Structures, and Properties of Five Coordination Compounds Based N-Heterocyclic Ligands." INDIAN JOURNAL OF HETEROCYCLIC CHEMISTRY 34, no. 02 (2024): 229. http://dx.doi.org/10.59467/ijhc.2024.34.229.

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Five coordination compounds based on 2,6-dihydroxypyrimidine-4-carboxylic acid (H3pymca), Ni2(Hpymca)2(bipy)(H2O)6?2H2O (1), Co2(Hpymca)2(bipy)(H2O)6?2H2O (2), Ni(Hpymca)(pya)(H2O)2 (3), Zn(Hpymca)(pyrapyri)(H2O)?H2O (4), and [Ba(H2pymca)2]n (5) (bipy = 4,4'-bipyridine, pya = pyridine-2-aldoxime, pyrapyri = 2-(1H-pyrazol-3-yl)pyridine) have been synthesized by hydrothermal methods and structurally characterized. The structure analyses showed that compounds 1 and 2 are isostructural with triclinic, P-1 space group, where the bipy molecule bridges with two metal ions, and Hpymca2- anions serve a

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17

Kashparova, V. P., E. N. Shubina, D. V. Tokarev, G. P. Antropov, and I, Yu Zhukova. "UNIVERSAL ELECTROCATALYTIC SYSTEM FOR CONVERSION OF ALCOHOLS INTO CARBONYL COMPOUNDS AND CARBOXY ACID FUNCTIONAL DERIVATIVES." Электрохимия 59, no. 10 (2023): 579–92. http://dx.doi.org/10.31857/s0424857023100079.

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A universal catalytic system 4-acetamido-2,2,6,6-tetramethylpiperidine-1-oxyl/KI/pyridine base for the conversion of alcohols into carbonyl compounds and derivatives of carboxylic acids has been developed. The use of pyridine, 2,6-lutidine or collidine made it possible to obtain carbonyl compounds (yield up to 100%) after 2-2.2 F/mol. In the presence of pyridine, aliphatic alcohols are converted to esters (yield up to 35%) after 3-4 F/mol. Acid anhydrides (yield up to 80%) are formed using 2,6-lutidine or collidine after 5-6 F/mol. Nitriles were obtained in the presence of 2,6-lutidine and a s

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18

Guo, Na, Haiyong Jia, Xing You, Du Jiang, Kui Lu, and Peng Yu. "Preparation of Novel Pyrrolo[2,3‐b]pyridine Derivatives via a New Concise Synthetic Approach." Bulletin of the Korean Chemical Society 36, no. 4 (2015): 1143–47. http://dx.doi.org/10.1002/bkcs.10212.

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The pyrrolo[2,3‐b]pyridine core structure, a bioisostere of quinolones, is found in several molecules that possess important biological activity. We describe here a new, concise, three‐step synthesis of pyrrolo[2,3‐b]pyridines starting from L‐alanine. A series of 4,7‐dihydro‐4‐oxo‐1H‐pyrrolo[2,3‐b]pyridine‐5‐carboxylic acid derivatives, which have not been previously reported, were synthesized using this approach.

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19

Verma, Krishna K., and Pramila Tyagi. "Determination of Nitrite via Reaction with Pyridine-4-Carboxylic Acid Hydrazide." Analytical Letters 18, no. 10 (1985): 1281–87. http://dx.doi.org/10.1080/00032718508066209.

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20

Chruszcz-Lipska, Katarzyna, Malgorzata Baranska, and Leonard M. Proniewicz. "The sequence of deprotonation of pyridine-6-phospho-4-carboxylic acid." Journal of Molecular Structure: THEOCHEM 905, no. 1-3 (2009): 81–85. http://dx.doi.org/10.1016/j.theochem.2009.03.015.

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21

Vural, Hatice. "Experimental and computational studies of 4-(Trifluoromethyl)pyridine-2-carboxylic acid." Journal of Molecular Structure 1111 (May 2016): 55–60. http://dx.doi.org/10.1016/j.molstruc.2016.01.076.

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22

Smith, Graham, Katherine E. Baldry, Karl A. Byriel, and Colin H. L. Kennard. "Molecular Cocrystals of Carboxylic Acids. XXV The Utility of Urea in Structure Making with Carboxylic Acids and the Crystal Structures of a Set of Six Adducts with Aromatic Acids." Australian Journal of Chemistry 50, no. 7 (1997): 727. http://dx.doi.org/10.1071/c96199.

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Molecular adducts of urea with six aromatic carboxylic acids have been prepared and characterized by using X-ray diffraction methods and infrared spectroscopy. These compounds are with 5-nitrosalicylic acid [(C7H5NO5)2(CH4N2O)] (1), 3,5-dinitrosalicylic acid [(C7H4N2O7)(CH4N2O)] (2), 4-aminobenzoic acid [(C7H7NO2)2(CH4N2O)] (3), o-phthalic acid [(C8H6O4)(CH4N2O)] (4), pyrazine-2,3-dicarboxylic acid [(C4H4N2O4)(CH4N2O)] (5) and pyridine-2,6-dicarboxylic acid [(C7H5NO4)(CH4N2O)2] (6). In the majority of the adducts, all six potential interactive sites on the urea molecules are utilized in hydrog

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23

Yao, Shuo, Dongmei Wang, Yu Cao, Guanghua Li, Qisheng Huo, and Yunling Liu. "Two stable 3D porous metal–organic frameworks with high performance for gas adsorption and separation." Journal of Materials Chemistry A 3, no. 32 (2015): 16627–32. http://dx.doi.org/10.1039/c5ta03886c.

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Two porous MOFs, [NO<sub>3</sub>][In<sub>3</sub>OL<sub>3</sub>]·4DMF·3H<sub>2</sub>O (JLU-Liu18) and [CdL]·0.5DMF (JLU-Liu19), H<sub>2</sub>L = pyridine-3,5-bis(phenyl-4-carboxylic acid), have been solvothermally synthesized and structurally characterized.

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24

Bylov, I. E. "Synthesis of phenyl esters 2-oxo-2H-1-benzopyran-3-carboxylic acids as promising antimicrobial agents." Voprosy Khimii i Khimicheskoi Tekhnologii, no. 3 (July 2024): 30–36. http://dx.doi.org/10.32434/0321-4095-2024-154-3-30-36.

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Corresponding chloroanhydrides were synthesized by the interaction of coumarin-3-carboxylic and 6-methoxycoumarin-3-carboxylic acids with an excess of thionyl chloride under heating. Due to the quantitative yields and the formation of volatile products within the reaction, chloroanhydrides were used without additional purification in acylation of substituted phenols for the synthesis of phenyl esters of 2-oxo-2H-1-benzopyran-3-carboxylic acids. The reaction was carried out by heating in anhydrous dioxane environment in the presence of pyridine as a catalyst. The structure of the obtained ester

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25

Hamada, Nagwa M. M., Sohila H. Mancy, and Mohamed A. El Sekily. "A Facile Synthesis, Spectroscopic Identification, and Antimicrobial Activities of Some New Heterocyclic Derivatives from D-erythro-2,3-hexodiuloso-1,4-lactone-2-(o-chlorophenyl hydrazone)-3-oxime." International Journal of Chemistry 16, no. 2 (2024): 62. http://dx.doi.org/10.5539/ijc.v16n2p62.

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A new series of different heterocyclic derivatives was prepared via a facile unimolecular condensation of D-iso ascorbic acid with o-chlorophenyl hydrazine to give D-erythro-2,3-hexodiulosono-1,4-lactone 2-( o-chlorophenyl hydrazine (2). Reactions of&nbsp;(2)&nbsp;with hydroxylamine gave the 2-( o-chlorophenyl hydrazone)-3-oxime (3). On boiling with boiling acetyl chloride,&nbsp;(3)&nbsp;gave 2-o-chlorophenyl-4-(2,3-di-O-acetyl-D-erythro-glyceryl-1-yl)-1,2,3-triazole-5-carboxylic acid-5,1́-lactone (4). In the treatment of (3) with benzoyl chloride in pyridine the same dehydrati

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26

Hamada, Nagwa M. M., Sohila H. Mancy, and Mohamed A. El Sekily. "A Facile Synthesis, Spectroscopic Identification, and Antimicrobial Activities of Some New Heterocyclic Derivatives from D-erythro-2,3-hexodiuloso-1,4-lactone-2-(o-chlorophenyl hydrazone)-3-oxime." International Journal of Chemistry 17, no. 2 (2025): 50. https://doi.org/10.5539/ijc.v17n2p50.

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A new series of different heterocyclic derivatives was prepared via a facile unimolecular condensation of D-iso ascorbic acid with o-chlorophenyl hydrazine to give D-erythro-2,3-hexodiulosono-1,4-lactone 2-( o-chlorophenyl hydrazine (2). Reactions of&nbsp;(2)&nbsp;with hydroxylamine gave the 2-( o-chlorophenyl hydrazone)-3-oxime (3). On boiling with boiling acetyl chloride,&nbsp;(3)&nbsp;gave 2-o-chlorophenyl-4-(2,3-di-O-acetyl-D-erythro-glyceryl-1-yl)-1,2,3-triazole-5-carboxylic acid-5,1́-lactone (4). In the treatment of (3) with benzoyl chloride in pyridine the same dehydrati

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27

Zacharopoulos, Nikolaos, Gregor Schnakenburg, Eleni I. Panagopoulou, Nikolaos S. Thomaidis, and Athanassios I. Philippopoulos. "Pyridine–Quinoline and Biquinoline-Based Ruthenium p-Cymene Complexes as Efficient Catalysts for Transfer Hydrogenation Studies: Synthesis and Structural Characterization." Molecules 30, no. 14 (2025): 2945. https://doi.org/10.3390/molecules30142945.

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Searching for new and efficient transfer hydrogenation catalysts, a series of new organometallic ruthenium(II)-arene complexes of the formulae [Ru(η6-p-cymene)(L)Cl][PF6] (1–8) and [Ru(η6-p-cymene)(L)Cl][Ru(η6-p-cymene)Cl3] (9–11) were synthesized and fully characterized. These were prepared from the reaction of pyridine–quinoline and biquinoline-based ligands (L) with [Ru(η6-p-cymene)(μ-Cl)Cl]2, in 1:2 and 1:1, metal (M) to ligand (L) molar ratios. Characterization includes a combination of spectroscopic methods (FT-IR, UV-Vis, multi nuclear NMR), elemental analysis and single-crystal X-ray c

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28

N., B. Patel, and N. Agravat S. "Synthesis, characterization and biological screening of some new pyridine derivatives." Journal of Indian Chemical Society Vol. 84, Aug 2007 (2007): 785–91. https://doi.org/10.5281/zenodo.5824938.

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Department of Chemistry, Veer Narmad South Gujarat University, Surat-395 007, Gujarat, India <em>E-mail</em>: drnavin @satyam.net.in; snagravat@yahoo.co.in <em>Manuscript received 18 August 2006, revised 26 March 2007, accepted 13 June 2007</em> 2-Amino substituted benzothiazole 2<sub>1_12</sub> and<em> p</em>-acetamidobenzenesulfonyl chloride 1 were used to prepare <em>N"</em>-(<em>p</em>anilinosulfonamido) substitutedbenzothiazole 4<sub>1_12</sub> using mixture of pyridine and acetic anhydride which formed (<em>N</em>-acetyl pyridinium) an cleetrophilic complex which facilitated condens

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29

Ostapova, Elena V., Sergey Yu Lyrschikov, and Heinrich N. Altshuler. "Equilibrium constants of the sorption of pyridinecarboxylic acids by polystyrene type sulfocationite." Butlerov Communications 64, no. 10 (2020): 55–62. http://dx.doi.org/10.37952/roi-jbc-01/20-64-10-55.

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The processes of sorption of pyridine-3-carboxylic (nicotinic) and pyridine-4-carboxylic (isonicotinic) acids by sulfonic acid cation exchangers of the polystyrene type (CU-2-4 and CU-2-8) from aqueous solutions with different pH values were studied. Analysis of the FTIR spectra of isonicotinic acid, isonicotinic acid sulfate, and CU-2-8 sulfonic cation exchanger filled with isonicotinic acid showed that pyridinecarboxylic acid is in the protonated form in the polymer phase. Experimental data of the equilibrium distribution of acids in the aqueous solution-cation exchange system have been obta

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30

Chaitra, T. K., K. N. Mohana, and H. C. Tandon. "Study of New Thiazole Based Pyridine Derivatives as Potential Corrosion Inhibitors for Mild Steel: Theoretical and Experimental Approach." International Journal of Corrosion 2016 (2016): 1–21. http://dx.doi.org/10.1155/2016/9532809.

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Three new thiazole based pyridine derivatives 5-(4-methoxy-phenyl)-thiazole-2-carboxylic acid pyridin-2-ylmethylene-hydrazide (2-MTPH), 5-(4-methoxy-phenyl)-thiazole-2-carboxylic acid pyridin-3-ylmethylene-hydrazide (3-MTPH), and 5-(4-methoxy-phenyl)-thiazole-2-carboxylic acid pyridin-4-ylmethylene-hydrazide (4-MTPH) were synthesized and characterized. Corrosion inhibition performance of the prepared compounds on mild steel in 0.5 M HCl was studied using gravimetric, potentiodynamic polarisation, and electrochemical impedance techniques. Inhibition efficiency has direct relation with concentra

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31

Zhu, Xiong, Yue Wang, and Tao Lu. "2-[3-Cyano-4-(2-methylpropoxy)phenyl]-4-methylthiazole-5-carboxylic acid pyridine solvate." Acta Crystallographica Section E Structure Reports Online 65, no. 11 (2009): o2603. http://dx.doi.org/10.1107/s1600536809039002.

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32

Chruszcz-Lipska, Katarzyna, Malgorzata Baranska, and Leonard M. Proniewicz. "Vibrational study of calcium salt of pyridine-2-phospho-4-carboxylic acid." Chemical Physics Letters 451, no. 1-3 (2008): 127–31. http://dx.doi.org/10.1016/j.cplett.2007.11.082.

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33

Yakovenko, G. G., and M. V. Vovk. "Convenient approaches to the synthesis of 6-amino- and 6-oxoimidazo[4,5-b]pyrazolo[3,4-e]pyridines." Journal of Organic and Pharmaceutical Chemistry 19, no. 1(73) (2021): 10–15. http://dx.doi.org/10.24959/ophcj.21.224583.

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Aim. To develop convenient approaches to the synthesis of 6-amino- and 6-oxoimidazo[4,5-b]pyrazolo[3,4-e]pyridines as promising biologically active scaﬀolds.Results and discussion. It has been found that cyclocondensation of N-Boc-4-aminopyrazole-5-carbaldehydes with creatinine can be used as an eﬀective method for obtaining 6-aminoimidazo[4,5-b]pyrazolo[3,4-e]pyridines previously unknown. For the synthesis of their 6-oxoanalogs, the reaction of 5-aminopyrazolo[4,3-b]pyridine-6-carboxylic acids used in a modifed Curtius rearrangement with diphenylphosphorylazide was successful. This method was

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34

Huang, Zhidao, Michelle E. Akana, Kyana M. Sanders, and Daniel J. Weix. "A decarbonylative approach to alkylnickel intermediates and C(sp ³ )-C(sp ³ ) bond formation." Science 385, no. 6715 (2024): 1331–37. http://dx.doi.org/10.1126/science.abi4860.

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The myriad nickel-catalyzed cross-coupling reactions rely on the formation of an organonickel intermediate, but limitations in forming monoalkylnickel species have limited options for C(sp 3 ) cross-coupling. The formation of monoalkylnickel(II) species from abundant carboxylic acid esters would be valuable, but carboxylic acid derivatives are primarily decarboxylated to form alkyl radicals that lack the correct reactivity. In this work, we disclose a facile oxidative addition and decarbonylation sequence that forms monoalkylnickel(II) intermediates through a nonradical process. The key ligand

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35

Smith, Graham, Urs D. Wermuth, Peter C. Healy, and Jonathan M. White. "Structure-Making with 3,5-Dinitrosalicylic Acid. II. The Proton-Transfer Compounds of 3,5-Dinitrosalicylic Acid with the Monocyclic Heteroaromatic Amines." Australian Journal of Chemistry 56, no. 7 (2003): 707. http://dx.doi.org/10.1071/ch02163.

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The crystal structures of the proton-transfer compounds of 3,5-dinitrosalicylic acid (dnsa) with a series of common monocyclic heteroaromatic amines (pyridine, 4-cyanopyridine, pyridine-4-carboxylic acid, 2,6-diaminopyridine, and 2-aminopyrimidine) have been determined and the hydrogen-bonding associations in each analyzed. The compounds are the adduct [(C5H6N)+(dnsa)–· (dnsa)] (1), the 1 : 1 salts [(C6H5N2)+(dnsa)–] (2), [(C6H6NO2)+(dnsa)–] (3), [(C5H8N3)+(dnsa)–] (4), and the 2 : 2 ethanol hemi-solvate [2(C4H6N3)+·2(dnsa)–· 0.5(EtOH)] (5). With all compounds, protonation of the hetero-nitrog

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36

Cowan, John A., Judith A. K. Howard, Garry, J. McIntyre, Samuel M. F. Lo, and Ian D. Williams. "Variable-temperature neutron diffraction studies of the short, strong hydrogen bonds in the crystal structure of pyridine-3,5-dicarboxylic acid." Acta Crystallographica Section B Structural Science 61, no. 6 (2005): 724–30. http://dx.doi.org/10.1107/s0108768105030077.

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Pyridine-3,5-dicarboxylic acid has been studied by single-crystal neutron diffraction at 15 and 296 K. Pyridine-3,5-dicarboxylic acid, in which the carboxylic acid protons have been replaced by deuterons, has also been studied at 15, 150 and 296 K. The protonated structure contains a short N...H...O hydrogen bond [N...O 2.523 (2) Å at 15 K]. Temperature-dependent proton migration occurs where the N—H distance in the hydrogen bond changes from 1.213 (4) Å at 15 K to 1.308 (6) Å at 300 K. In the deuterated structure the overall hydrogen-bond length increased [N...O 2.538 (3) Å at 15 K] and the m

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37

Kandukuri, Usha Rani, and D.A Padmavathi. "OMPUTATIONAL STUDY OF CYCLIC DERIVATIVES FROM PYRIDINE-4-CARBOXYLIC ACID AS POTENTIAL ANTI-TB AGENTS." Biolife 2, no. 1 (2022): 392–95. https://doi.org/10.5281/zenodo.7198316.

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<strong>ABSTRACT</strong>   <em>Mycobacterium tuberculosis</em>, the causative agent of tuberculosis (TB), is a remarkably successful pathogen that has latently infected a third of the world population. The objective is to model new molecular scaffolds by re- engineering and repositioning old drug families. Existing TB drugs isoniazid, thioamides belonging to the class of pyridine 4-carboxylic acid were substituted with an allyl or Propargylic groups at 2,6 positions. Molecular modeling tool is used to check and compare the structure and stability of existing TB drugs isoniazid, thioamide

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38

Bencková, Mária, and Alžbeta Krutošíková. "5-Aminofuro[3,2-c]pyridinium Tosylates and Substituted Furo[3,2-c]pyridine N-Oxides: Synthesis and Reactions." Collection of Czechoslovak Chemical Communications 64, no. 3 (1999): 539–47. http://dx.doi.org/10.1135/cccc19990539.

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5-Aminofuro[3,2-c]pyridinium tosylates 2a-2c were synthesized by direct N-amination of furo[3,2-c]pyridines 1a-1c with O-(4-methylbenzenesulfonyl)hydroxylamine in dichloromethane. Zwitterionic furo[3,2-c]pyridinium N-imides 3a-3c generated from 2a-2c and anhydrous potassium carbonate in N,N-dimethylformamide afforded by 1,3-dipolar cycloaddition reactions with dimethyl butynedioate or ethyl propiolate the corresponding furo[3,2-c]pyrazolo[1,5-a]pyridinecarboxylic esters 4a-4c and 5a-5c. Furo[3,2-c]pyridine N-oxides 6a-6c and their benzo derivative 6d were synthesized by reaction of 1 with 3-ch

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39

Pokhodylo, N. "Synthesis of 1H-1,2,3-triazole-4-carboxylic acid derivatives with hydrogenated pyridine fragment." Visnyk of the Lviv University. Series Chemistry 59, no. 2 (2018): 286. http://dx.doi.org/10.30970/vch.5902.286.

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40

Patoliya, M. J., and G. J. Kharadi. "Synthesis and Bioevaluation of Novel Imatinib Base Derivatives via 1,1′-Carbonyldiimidazole Catalyst." Journal of Chemistry 2013 (2013): 1–7. http://dx.doi.org/10.1155/2013/915381.

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A series of eleven compounds were synthesized from 6-methyl-N′-(4-(pyridine-3-yl)pyrimidin-2-yl)benzene-1,3-diamine with various substituted carboxylic acid under solvent-free conditions using 1,1′-carbonyldiimidazole (CDI) as a catalyst. The yields of compounds are more than 72%. All the compounds were characterized by physical, spectroscopic, and elemental analysis. Compound8bexhibited good inhibition towards antimicrobial activity compared to the other compounds.

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41

Wang, Qing, Zi Li Suo, Yong Kui Zhang, Quan Hou, and Hui Li. "X-ray powder diffraction data for 1-(4-methoxyphenyl)-7-oxo-6-[4-(2-oxopiperidin-1-yl)phenyl]-4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridine-3-carboxylic acid ethyl ester, C27H28N4O5." Powder Diffraction 32, no. 3 (2017): 206–9. http://dx.doi.org/10.1017/s0885715617000574.

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1-(4-methoxyphenyl)-7-oxo-6-[4-(2-oxopiperidin-1-yl)phenyl]-4,5,6,7- tetrahydro-1H-pyrazolo[3,4-c]pyridine-3-carboxylic acid ethyl ester is an important intermediate in the synthesis of the anticoagulant, apixaban. X-ray powder diffraction data for this compound are reported [a = 14.101(4) Å, b = 10.105(6) Å, c = 9.532(7) Å, α = 72.774(1)°, β = 97.356(3)°, γ = 108.237(3)°, unit-cell volume V = 1231.45 Å3, Z = 2, and space group P-1]. No detectable impurities were observed.

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42

Galadzhun, Iurii, Rafal Kulmaczewski, and and Malcolm A. Halcrow. "Five 2,6-Di(pyrazol-1-yl)pyridine-4-carboxylate Esters, and the Spin States of their Iron(II) Complexes." Magnetochemistry 5, no. 1 (2019): 9. http://dx.doi.org/10.3390/magnetochemistry5010009.

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Two phenyl ester and three benzyl ester derivatives have been synthesized from 2,6-di(pyrazol-1-yl)pyridine-4-carboxylic acid and the appropriate phenyl or benzyl alcohol using N,N’-dicyclohexylcarbodiimide as the coupling reagent. Complexation of the ligands with Fe[BF4]2·6H2O in acetone yielded the corresponding [FeL2][BF4]2 complex salts. Four of the new ligands and four of the complexes have been crystallographically characterised. Particularly noteworthy are two polymorphs of [Fe(L3)2][BF4]2·2MeNO2 (L3 = 3,4-dimethoxyphenyl 2,6-di{pyrazol-1-yl}pyridine-4-carboxylate), one of which is crys

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43

Shi, Ting, Li Zheng, Xiang-Qian Li, et al. "Nitrogenous Compounds from the Antarctic Fungus Pseudogymnoascus sp. HSX2#-11." Molecules 26, no. 9 (2021): 2636. http://dx.doi.org/10.3390/molecules26092636.

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The species Pseudogymnoascus is known as a psychrophilic pathogenic fungus which is ubiquitously distributed in Antarctica. While the studies of its secondary metabolites are infrequent. Systematic research of the metabolites of the Antarctic fungus Pseudogymnoascus sp. HSX2#-11 led to the isolation of one new pyridine derivative, 4-(2-methoxycarbonyl-ethyl)-pyridine-2-carboxylic acid methyl ester (1), together with one pyrimidine, thymine (2), and eight diketopiperazines, cyclo-(dehydroAla-l-Val) (3), cyclo-(dehydroAla-l-Ile) (4), cyclo-(dehydroAla-l-Leu) (5), cyclo-(dehydroAla-l-Phe) (6), cy

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SARBESHWAR, MISHRA, and M. PUROHIT K. "Studies on some Anionic Complexes of Oxovanadium(IV)." Journal Of Indian Chemical Society Vol. 66, Jan 1989 (1989): 53–54. https://doi.org/10.5281/zenodo.6116425.

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Department of Chemistry, Regional Engineering College, Rourkela-769 008 <em>Manuscript received 10 December 1987, revised 18 September 1988, accepted 4 October 1988</em> THE chemistry of oxovanadium(iv) is of interest  from chemical, structural and biological point of view<sup>1-5</sup>. Keeping this in view and our interest in the chemistry of mixed ligand complexes<sup>6-8</sup>, we report here the synthesis and characterisation of some mixed ligand anionic complexes of oxovanadium(iv) of the type M[VOL<sub>2</sub>X], where M = Na or K ; X=SCN<sup>-</sup> or \(N^-_2\

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45

Madeley, Lee G., Demetrius C. Levendis, and Andreas Lemmerer. "Covalent-assisted supramolecular synthesis: the effect of hydrogen bonding in cocrystals of 4-tert-butylbenzoic acid with isoniazid and its derivatized forms." Acta Crystallographica Section C Structural Chemistry 75, no. 2 (2019): 200–207. http://dx.doi.org/10.1107/s205322961900055x.

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A series of cocrystals of isoniazid and four of its derivatives have been produced with the cocrystal former 4-tert-butylbenzoic acid via a one-pot covalent and supramolecular synthesis, namely 4-tert-butylbenzoic acid–isoniazid, C6H7N3O·C11H14O2, 4-tert-butylbenzoic acid–N′-(propan-2-ylidene)isonicotinohydrazide, C9H11N3O·C11H14O2, 4-tert-butylbenzoic acid–N′-(butan-2-ylidene)isonicotinohydrazide, C10H13N3O·C11H14O2, 4-tert-butylbenzoic acid–N′-(diphenylmethylidene)isonicotinohydrazide, C19H15N3O·C11H14O2, and 4-tert-butylbenzoic acid–N′-(4-hydroxy-4-methylpentan-2-ylidene)isonicotinohydrazid

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46

Dharmalingam, V., A. K. Ramasamy, and V. Balasuramanian. "Synthesis and EPR Studies of Copper Metal Complexes of Dyes Derived from Remazol Red B, Procino Yellow, Fast Green FCF, Brilliant Cresyl Blue with Copper Acetate Monohydrate." E-Journal of Chemistry 8, s1 (2011): S211—S224. http://dx.doi.org/10.1155/2011/625365.

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The synthesis and characterization of four new solid dye complexes, CuL2(L= 2-[2-methoxy-5-(propane-1-sulfonyl)-phenyl azo]-naphthalen-1-ol, 5-{[3-(4,6-dihydroxy-[1,3,5]tri azine-2-ylamino)-phenyl]-hydrazones}-1-ethyl-4-methyl-2,6-dioxo-1,2,5,6-tetrahydro-pyridine-3-carboxylic acid diethylamide, 4-{bis-[4-(benzyl-ethyl-amino)-phenyl]-methyl}-phenol and 7-imino-4-methyl-7H-phenoxazine-1,3-diamine) is reported. The mode for ligand coordination has been determined by IR and EPR spectra. The carboxyl and amino group of dyes coordinates to the Cu(II) atom as a unidentate or as a chelating ligand.

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47

Gu, Jinsong, and Xiuhui Lu. "A mechanistic study of 1,3,5-trisubstituted-1,2,3-triazoles by Ab initio method." Progress in Reaction Kinetics and Mechanism 45 (January 2020): 146867832092329. http://dx.doi.org/10.1177/1468678320923295.

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The mechanism of synthesis of 1,3,5-trisubstituted-1,2,4-triazoles from 3-thiopheneacetic acetic acid, 4-pyridine formamidine, and tri-fluoro ethyl hydrazine has been first investigated with B3LYP/6-311++G** method in this article. According to the potential energy profile, it can be predicted that the course of the reaction consists of six elementary reactions. The 3-thiopheneacetic acetic acid and 4-pyridine formamidine form first an intermediate product through a dehydration reaction; the intermediate product further combines with hydrogen ion to form a positive ions; the positive ion react

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48

Miklovič, Jozef, Miroslava Bašnárová, Peter Segľa, and Marián Koman. "SYNTHESIS, CRYSTAL STRUCTURE AND SPECTRAL PROPERTIES OF COPPER(II) AND COBALT(II) 3-METHYLTHIOPHENE-2- CARBOXYLATO COMPLEXES WITH FUROPYRIDINES." Nova Biotechnologica et Chimica 12, no. 2 (2013): 75–82. http://dx.doi.org/10.2478/nbec-2013-0009.

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Abstract The synthesis and characterization of eleven new Cu(II) and Co(II) complexes is reported. The complexes were characterized by elemental analyses, infrared and electronic spectra. Copper(II) with 3- methylthiophene-2-carboxylic acid (HMTK) forms a dinuclear complex of the acetate type [Cu2(MTK)4(H2O)2]. By reaction of this complex with 2-metylfuro[3,2-c]pyridine (MeFP), not only acetate type complexes [Cu2(MTK)4L2] (L= FP, MeFP) were obtained, but also monomeric complex [Cu(MTK)2(FP)2]. In the cases of [1]benzofuro[3,2-c]pyridine (BFP) and 2-(3-trifluoromethylphenyl) furo[3,2-c]pyridin

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49

Netthisinghe, Annesly, Paul Woosley, William Strunk, Getahun Agga, and Karamat Sistani. "Composting Dairy Manure with Biochar: Compost Characteristics, Aminopyralid Residual Concentrations, and Phytotoxicity Effects." Agronomy 14, no. 5 (2024): 952. http://dx.doi.org/10.3390/agronomy14050952.

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Aminopyralid (2-pyridine carboxylic acid, 4-amino-3, 6-dichloro-2-pyridine carboxylic acid) is an auxin herbicide that has been used widely to control broadleaf weeds in pasture and hay fields. With no post-application withdrawal time, aminopyralid absorbed into forage material can contaminate compost feed stocks such as hay, grass bedding material, and manure. Composts derived from such feed stocks raises concerns about after-effect injuries to sensitive crops by residual aminopyralids. Biochar (BC) additive may affect the composting process and immobilizes organic pollutants. This study exam

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50

Sankar, A., S. Ambalatharasu, G. Peramaiyan, G. Chakkaravarthi, and R. Kanagadurai. "2-Carboxylatopyridinium–4-nitrophenol (1/1)." Acta Crystallographica Section E Structure Reports Online 70, no. 4 (2014): o450. http://dx.doi.org/10.1107/s1600536814005650.

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In the title 1:1 adduct, C6H5NO3·C6H5NO2, both molecules are almost planar (r.m.s. deviations for the non-H atoms = 0.027 and 0.023 Å for 4-nitrophenol and 2-carboxylatopyridinium, respectively). The pyridine molecule crystallizes as a zwitterion (nominal proton transfer from the carboxylic acid group to the N atom in the ring). In the crystal, inversion dimers of the zwitterions linked by pairs of N—H...O hydrogen bonds generateR22(10) loops; two 4-nitrophenol molecules link to the dimer by O—H...O hydrogen bonds, generating a four-molecule aggregate. These are linked by C—H...O interactions,

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